If you’ve not started assembling anything yet, press the golden button between the “A” and “S” pads on the board (if you’ve already assembled it, unplug it and hold the “space” and “esc” keys while plugging in the USB cable)

Open FLIP

In FLIP, hit connect to the device, and select “ATMega32U4”

Hit “ctrl” + “U” keys to connect to the Zeal 60 PCB

Hit “ctrl” + “L” to load a file

Select the “default.hex” file in the Zeal 60 folder you extracted to your desktop